package day03;

import java.util.Scanner;

public class HWStore {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n=9;
        while (n<99999) {
            System.out.println("请输入成绩");
            int score = scanner.nextInt();
            if (score >= 0 && score <= 100) {
                if (score >= 90) {
                    System.out.println("A");
                } else if (score >= 80 && score <= 90) {
                    System.out.println("B");
                } else if (score >= 60 && score <= 80) {
                    System.out.println("C");
                } else {
                    System.out.println("D");
                }



            } else {
                System.out.println(score+"该成绩不合法\n");
            }
        }
    }
}
